Well y'all know I get contrary at times and this is one of them. Actually it seems that all my points agree with some of the posts above, and at the same time disagree with other opinions expressed.
If you burned some oil in your pan--particularly if you heated it above its smoke point--and it left a residue you couldn't remove with soap and water and a non scratch scrubber, then yes that's what caused your problem. (Obviously in fact.)
If you scraped it with any object (a spoon perhaps) and removed the stain then depending on how hard you scraped it you may have scratched the non-stick finish, in which case your wok is not ruined but it is degraded. Depending on how big the damaged area is it may or may not be a problem. Use it and see if you still like using it, or not.
Here is my biggest contrary opinion. I disagree that you have to get your wok to 500 degrees for wok cooking. I doubt I ever get that hot. Note also, food is likely to stick to your pan at that temperature unless you use some kind of cooking liquid or oil. Highest smoke point oil is avocado oil at 520F. Soy oil is rather common in Asia, smoke point 495F and inexpensive (compared to avocado) so you might use it at high temperatures.
But I'm sure my wok never reaches 500F, and I cook a lot of Asian food, particularly Thai and Chinese. I take issue that you need to go that hot when cooking Asian foods.
My best wok is a non-stick somewhat more rounded than usual pan (with cover) made by Invitations -- an economy brand sold by Bed, Bath & Beyond... I use it for many kinds of cooking including wok dishes. The one thing it won't do is sometimes you want to slide wok ingredients up the side of the pan to get less heat, and leave other ingredients in the middle at the hottest spot. Doesn't work with this pan but my cooking methodology is to start out with the ingredients that need the most cooking and progressively add ingredients that cook more quickly. I also sometimes remove partially cooked ingredients and set them aside until a final cooking stage where I return all the ingredients to the pan.
Finally, this is what I would have done when faced with the difficult to remove stain: Easy Off oven cleaner. Yes it could damage non-stick surfaces or may not and there's only one way to tell. If you've already tried everything on the pan and it's still unsatisfactory, then you have nothing to lose by trying Easy Off. Spray some on, let it sit for perhaps 15-20 minutes, wash it off with soap and water, repeat if necessary. After the spot is gone examine the pan and decide if it's useable or not.
And note, the sure way to ruin a non-stick pot or pan is to put it on a flame or other heat source with nothing in it. You can get non-stick pots and pans fairly hot as long is there is food or liquid in it, the heat transfers to the food. With nothing in the pan there is nothing to limit the heat rise and most if not all non-stick coatings can turn toxic when overheated. You would of course have to discard such a pan because the toxic substances may get in your food.
So if you horribly scratched it with scraping, probably toss it. If it's not that bad then consider the Easy Off approach, and if it takes the spot off then you can consider whether you think it's useable.
And finally finally, why not have more than one wok? Get a non-stick one, get a steel one. You may find like I have that sometimes you want one, sometimes you want the other.